ci: Split stage in GHA

.github/workflows/main.yml

@@ -10,12 +10,35 @@ on:
   workflow_dispatch:
 
 jobs:
-  test:
+  build:
     runs-on: 'ubuntu-latest'
     steps:
       - uses: 'actions/checkout@v4'
+      - uses: 'actions/cache@v4'
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('Cargo.lock') }}
       - name: 'Build'
         run: cargo build --verbose
+  unittest:
+    needs: [build]
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: 'actions/checkout@v4'
+      - uses: 'actions/cache/restore@v4'
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('Cargo.lock') }}
       - name: 'Run test'
         run: cargo test --verbose